What does the EGR system actually do on a diesel engine? In modern inline-six engines used in semi trucks, exhaust gases don’t just leave the engine — a portion is routed back into the intake through the EGR system.As exhaust gases drive the turbo and fresh air is cooled and fed into the intake, the EGR valve diverts a controlled amount of exhaust through a cooler and reintroduces it into the intake stream. This process is called Exhaust Gas Recirculation (EGR).EGR isn’t designed for performance
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How Sensors Control the EGR System on a DD15 🔧💨⚙️ On the intake side of the DD15, exhaust gas recirculation completes its path back into the engine. The EGR cooler feeds exhaust through a tube into the intake, and a delta-P (differential pressure) sensor monitors pressure on both sides of the system. That sensor — along with others like the intake temperature sensor — helps the ECM control the EGR valve. If the delta-P passages clog, EGR flow becomes inaccurate and drivability problems begin.
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